281 Issue 1 - Service Manual - BX3
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4.0 INSTALLATION & COMMISSIONING
REFER TO HEATING INSTALLER’S MANUAL FOR INSTALLATION AND COMMISSIONING
INSTRUCTIONS.
5.0 TROUBLESHOOTING
Most failure modes will result in a fault being logged in the HCDSI 24 -1 control board. These
faults can be viewed at the control Board. A brief description of each fault code is shown below,
followed by detailed troubleshooting for each fault code
.
5.1 LED Flash Codes
One green LED is used to display the status of the HCDSI24-1DT. The LED flashes up to 12
times on a 4.8-second repeat to indicate fault status.
LED
CONDITION
NORMAL OPERATION
Slow single flash
(200mS flashcode:
HCDS123 is functioning normally, and is in an idle state
111111110000000000000000)
Slow double flash
(200mS flashcode:
HCDS123 is functioning normally, with the thermostat
closed
111100001111000000000000)
FAULT
One flash
repeated every 4.8
Overheat condition
seconds (200mS flashcode:
Overheat in progress
100000000000000000000000)
Overheat switch is disconnected or O/C
Two flash
(200mS flashcode:
Pressure Switch inactive.
Fan running but pressure
switch
101000000000000000000000)
is still open. Fan stopped but pressure switch is still closed
Three flash
( 200mS flashcode:
Purge / Interwait
101010000000000000000000)
Timer operating eg: Stat off during flame Establishment
time
Flame establishment time elapsed without flame
Four flash
(200mS flashcode:
Pressure Switch Lockout.
Pressure Switch not
functional.
101010100000000000000000)
Fail to close timeout / fail to open timeout
Five flash
(200mS flashcode:
Ignition Lockout
- failure to ignite flame. Max number of
101010101000000000000000)
re-ignition / spark restoration attempts has been reached.
Six flash
(200mS flashcode
Valve Fault Lockout
- Valve Detection Failure.
101010101010000000000000)
Valve is disconnected. Gas valve drive relay contacts fail
to
close. Gas valve drive Triac fault: Open or half-wave.
Seven flash
(200mS flashcode:
Over-temp Lockout. Too many Hi-Limit activations in
101010101010100000000000)
latest heat cycles. Hi-Limit activation continues longer than
Hi-Limit fan + cool down times.
Eight flash
(200mS flashcode:
Frequency Lockout
- Timing fault.
101010101010101000000000)
Supply frequency outside operating limits.
Microprocessor clock outside operating limits.
